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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stddef.h>
#include <stdint.h>
enum class TransferDirection : uint64_t {
READ = 0,
WRITE = 1,
};
struct TransferId {
TransferDirection direction : 1;
uint64_t id : 63;
constexpr TransferId() : TransferId(TransferDirection::READ, 0) {}
TransferId(const TransferId& copy) = default;
TransferId(TransferId&& move) = default;
TransferId& operator=(const TransferId& copy) = default;
TransferId& operator=(TransferId&& move) = default;
private:
constexpr TransferId(TransferDirection direction, uint64_t id) : direction(direction), id(id) {}
public:
bool operator==(const TransferId& rhs) const {
return static_cast<uint64_t>(*this) == static_cast<uint64_t>(rhs);
}
constexpr explicit operator uint64_t() const {
return static_cast<uint64_t>(direction) << 63 | id;
}
static constexpr TransferId read(uint64_t id) {
return TransferId(TransferDirection::READ, id);
}
static constexpr TransferId write(uint64_t id) {
return TransferId(TransferDirection::WRITE, id);
}
static constexpr TransferId from_value(uint64_t value) {
uint64_t mask = static_cast<uint64_t>(1) << 63;
TransferId result;
result.direction = static_cast<TransferDirection>(!!(value & mask));
result.id = value & (mask - 1);
return result;
}
};
namespace std {
template <>
struct hash<TransferId> {
size_t operator()(TransferId id) const { return hash<uint64_t>()(static_cast<uint64_t>(id)); }
};
} // namespace std
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